Cannot move Planar Track bounding box points
I figured out what the problem is.  I am using the MAYA Input User Preferences, and in the Clip preferences there is no input setting for moving the Plane Marker as there is in the Blender input settings. If I switch to the Blender Input Prefs the mouse manipulations work. So I had to create a new input binding under the Maya Input Prefs just like the one in the Blender Prefs.  It works now.

The input binding is under Input->Clip->Clip Editor->Slide Plane Marker.